I've tried my servers and they don't see the patches that Microsoft has released. Usually Windows Update automatically installs them on Wednesday, so it must be something late in the day -- yet I can't find this info anywhere on either the Wikipedia page or on Microsoft's site for Patch Tuesday. Anyone have authoritative source for the time of day they are released?

That would be 1800 UTC during winter and 1700 UTC during daylight savings time in the pacific zone. My experience is that it's usually a bit later than that; I normally see them about 1930-2000 UK time (ie 1130-1200 Pacific Time).
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Richard GadsdenOct 16 '09 at 11:02

I'm not worried about missing them; I want to do the patch deployment by hand in a certain sequence and without knowing when they will be released, I have to delay it a day (til tomorrow off-hours).
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Matt RogishAug 11 '09 at 16:28